典型文献
Energy transfer and luminescent properties of Tb3+and Tb3+, Yb3+doped CNGG phosphors
文献摘要:
In this work, calcium niobium gallium garnet (Ca3Nb1.6875Ga3.1875O12 - CNGG) ceramic samples single-doped with Tb3+ and co-doped with Tb3+ and Yb3+ ions were sintered by the solid-state reaction method. The structural characterization of the samples was carried out by X-ray diffraction measure-ments. The optimal concentration of Tb3+ ions corresponding to the maximum luminescence in the green spectral range in CNGG:x at%Tb (x=0.1, 0.5, 1, 2, 3, 4, and 5) was determined to be 4 at%. The time-resolved luminescence of the 5D4 level (Tb3+) in the CNGG:x at%Tb samples was analysed to explore the quenching mechanisms involved in the Tb3+green emission. Co-doped CNGG:4 at%Tb,y at%Yb (y=0.5, 2, 4, 6, 8, and 10) ceramics were prepared and investigated. It is shown that CNGG:4 at% Tb,y at% Yb phosphors exhibit intense green luminescence under ultra-violet (UV), visible (VIS), and near-infrared (NIR) excitation, thus demonstrating the presence of simultaneous down-conversion (DC) and up-conversion (UC) processes. The dependence of the UC luminescence intensity on the diode laser pumping power was measured and the results indicate a two-photon process based on cooperative energy transfer (CET). Under UV excitation, the lifetime of the 5D4 (Tb3+) level slowly increases with increase of Yb3+concentration, suggesting the energy transfer from Yb3+to Tb3+ions, while under NIR excitation, the lifetime of the 5D4 (Tb3+) level decreases with increase of Yb3+ ions concentration, indicating the presence of a strong energy transfer from Tb3+to Yb3+ions. The highest energy transfer efficiency ofηET ≈42% was determined for the CNGG:4 at% Tb,10 at% Yb sample. The obtained results indicate that CNGG:(Tb3+, Yb3+) could be efficient new yellowish-green-emitting phosphors.
文献关键词:
中图分类号:
作者姓名:
S.Hau;G.Stanciu;D.Avram;L.Gheorghe;C.Gheorghe
作者机构:
National Institute for Laser,Plasma and Radiation Physics,Solid State Quantum Electronics Laboratory,409 Atomistilor Street,P.O.Box MG-36,Magurele,077125,Ilfov,Romania
文献出处:
引用格式:
[1]S.Hau;G.Stanciu;D.Avram;L.Gheorghe;C.Gheorghe-.Energy transfer and luminescent properties of Tb3+and Tb3+, Yb3+doped CNGG phosphors)[J].稀土学报(英文版),2022(09):1445-1453
A类:
Tb3+and,Yb3+doped,CNGG,Ca3Nb1,6875Ga3,1875O12,Tb3+green,Yb3+concentration,Yb3+to,Tb3+ions,Tb3+to,Yb3+ions
B类:
Energy,transfer,luminescent,properties,phosphors,In,this,work,calcium,niobium,gallium,garnet,samples,single,were,sintered,by,solid,state,reaction,method,structural,characterization,was,carried,out,ray,diffraction,ments,optimal,corresponding,maximum,luminescence,spectral,range,determined,be,resolved,5D4,level,analysed,explore,quenching,mechanisms,involved,emission,Co,ceramics,prepared,investigated,It,shown,that,exhibit,intense,under,ultra,violet,UV,visible,VIS,near,infrared,NIR,excitation,thus,demonstrating,presence,simultaneous,down,conversion,DC,up,UC,processes,dependence,intensity,diode,laser,pumping,power,measured,results,indicate,two,photon,cooperative,energy,CET,Under,lifetime,slowly,increases,suggesting,from,while,decreases,indicating,strong,highest,efficiency,obtained,could,efficient,new,yellowish,emitting
AB值:
0.405016
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